Audi Q7 MK1 - screwed on a private sale - advice on extensive faults

[Leighton82]

Bought a 2007 Q7 yesterday. I acted in good faith but got shafted by a liar who misled me throughout. Long story but all sorts of issues cropped up on the drive home and feeling a bit foolish now. Got the following dashboard warning issues as a starting point (all amber):

- Engine management light
- ABS light
- Traction control light
- Air suspension light

The following also don't work:

- Sat nav
- Parking assist (graphics and sensor beeps)
- Adjustable wing mirrors
- The list goes on

Got a slight smell of diesel on the cabin too. FML. He'd obviously cleared some of the codes before I arrived.

I've put an OCDII module in the car and the following faults have emerged (it's a long list). Any possible insights around a potential common problem with all this? Seem to be a lot of voltage issues. Am I effectively going to be bankrupted by all the fixes. Not handy so not an option to do myself. Going into an independent Audi garage tomorrow. Feel stupid as always done well with 2nd hand cars in the past. Scared it will be £2k plus to fix. Thanks for any advice, good or bad.

4F. Body control unit #2 (VW TP2.0)4F. Body control unit #2 (VW TP2.0)
DTCs: 2
----------------------------
00532 [0x0214]
Supply voltage
Status: Pending fault present during this driving cycle, Test has not been completed, Validated and stored in non volatile memory
----------------------------
00446 [0x01BE]
Work restriction due to insufficient voltage; Functional restriction due to undervoltage
Status: Pending fault present during this driving cycle, Test has not been completed, Validated and stored in non volatile memory
============================
52. Front passenger door electronics52. Front passenger door electronics
DTCs: 1
----------------------------
00532 [0x0214]
Supply voltage
Status: Pending fault present during this driving cycle, Validated and stored in non volatile memory
============================
56. Head unit (MMI) (VW TP2.0)56. Head unit (MMI) (VW TP2.0)
DTCs: 1
----------------------------
00446 [0x01BE]
Work restriction due to insufficient voltage; Functional restriction due to undervoltage
Status: Pending fault present during this driving cycle, Validated and stored in non volatile memory
============================
61. Battery Regulation using CAN (VW TP2.0)61. Battery Regulation using CAN (VW TP2.0)
DTCs: 3
----------------------------
00532 [0x0214]
Supply voltage
Status: Pending fault present during this driving cycle, Validated and stored in non volatile memory
----------------------------
03041 [0x0BE1] Archive (inactive)
Energy management active
Status: Validated and stored in non volatile memory
----------------------------
02256 [0x08D0]
Quiescent current
Status: Pending fault present, Validated and stored in non volatile memory
============================
62. Rear left door electoronics (VW TP2.0)
No DTC found.
============================
67. Voice control (VW TP2.0)67. Voice control (VW TP2.0)
DTCs: 1
----------------------------
00532 [0x0214]
Supply voltage
Status: Pending fault present during this driving cycle, Validated and stored in non volatile memory
============================
6D. Tailgate/Boot lid
No DTC found.
============================
6F. Comfort system central module 26F. Comfort system central module 2
DTCs: 2
----------------------------
02960 [0x0B90]
The lamp in the rear bumper on the left; Light in the left rear bumper
Status: Pending fault present, Test is inhibited by other DTC, Validated and stored in non volatile memory, Validated fault present at time of request
----------------------------
00532 [0x0214]
Supply voltage
Status: Pending fault present during this driving cycle, Validated and stored in non volatile memory
============================
72. Rear right door electronics (VW TP2.0)
No DTC found.
============================
76. Parking assistant76. Parking assistant
DTCs: 4
----------------------------
00532 [0x0214]
Supply voltage
Status: Pending fault present during this driving cycle, Validated and stored in non volatile memory
----------------------------
00446 [0x01BE]
Work restriction due to insufficient voltage; Functional restriction due to undervoltage
Status: Pending fault present during this driving cycle, Validated and stored in non volatile memory
----------------------------
01517 [0x05ED]
Trailer Recognition Control Unit-J345; Trailer detection control unit-J345
Status: Test conditions are met, Validated and stored in non volatile memory
----------------------------
01627 [0x065B]
Parking Assist Sensor, Front Center Right-G253; Front right center parking aid sender-G253
Status: Test conditions are met, Validated and stored in non volatile memory, Validated fault present at time of request
============================
77. Telephone77. Telephone
DTCs: 1
----------------------------
00532 [0x0214]
Supply voltage
Status: Pending fault present during this driving cycle, Validated and stored in non volatile memory
============================
78. Slide Door Right (VW TP2.0)
No DTC found.

 

[Leighton82]

This too...

----------------------------
13128 [0x3348]
Activation of control unit for exhaust gas turbocharger 1-J724 electrical fault in the circuit
Status: Pending fault present, Test is inhibited by other DTC, Validated and stored in non volatile memory
============================
05. Authorization system for access and starting the engine05. Authorization system for access and starting the engine
DTCs: 2
----------------------------
00532 [0x0214]
Supply voltage
Status: Pending fault present during this driving cycle, Validated and stored in non volatile memory
----------------------------
00446 [0x01BE]
Work restriction due to insufficient voltage; Functional restriction due to undervoltage
Status: Pending fault present during this driving cycle, Validated and stored in non volatile memory

 

[Leighton82]

P0046 [0x0046]
Turbocharger (TC) boost control solenoid/supercharger (SC) boost control solenoid - circuit range/performance; Turbocharger 1 Wastegate Solenoid Valve Control Circuit High Temperature
Status: Confirmed
----------------------------
P2011 [0x2011]
Intake manifold air control actuator, bank 2 - open circuit
Status: Confirmed
----------------------------
P0243 [0x0243]
Turbocharger (TC) wastegate regulating valve A - circuit malfunction
Turbocharger Wastegate Solenoid 1
Status: Pending
============================
19. CAN Gateway19. CAN Gateway
DTCs: 2
----------------------------
01517 [0x05ED]
Trailer Recognition Control Unit-J345; Trailer detection control unit-J345
Status: Test conditions are met, Validated and stored in non volatile memory

 

[Leighton82]

============================
03. ABS control unit03. ABS control unit
DTCs: 5
----------------------------
00668 [0x029C]
Vehicle voltage, terminal 30; On-board voltage terminal 30
Status: Pending fault present during this driving cycle, Validated and stored in non volatile memory
----------------------------
01826 [0x0722] Archive (inactive)
Steering angle sensor-G85, supply voltage on cell 30; Steering angle encoder G85, KL30 power supply; Gearbox output speed sender G195 no signal
Status: Validated and stored in non volatile memory
----------------------------
01673 [0x0689]
Brake booster diaphragm potentiometer; Potentiometer for diaphragm travel in the brake booster
Status: Test conditions are met, Test is inhibited by other DTC, Validated and stored in non volatile memory
----------------------------
01276 [0x04FC]
Hydraulic Pump ABS-V64; Hydraulic pump ABS-V64
Status: Pending fault present during this driving cycle, Test conditions are met, Test is inhibited by other DTC, Validated and stored in non volatile memory
----------------------------
01044 [0x0414]
Incorrectly coded control unit; Control unit encoded incorrectly; Secondary air injection valve-N112 short circuit
Status: Validated and stored in non volatile memory, Validated fault present at time of request

 

[Leighton82]

01. Engine control unit01. Engine control unit
DTCs: 3
----------------------------
04120 [0x1018]
Intake manifold flap 2 for air flow control lower stop not reached
Status: Pending fault present, Validated and stored in non volatile memory, Validated fault present at time of request
----------------------------
08598 [0x2196]
Lambda probe 1 bank 1 signal too rich
Status: Pending fault present during this driving cycle, Test has not been completed, Validated and stored in non volatile memory, Validated fault present at time of request
----------------------------
13128 [0x3348]
Activation of control unit for exhaust gas turbocharger 1-J724 electrical fault in the circuit
Status: Pending fault present, Test is inhibited by other DTC, Validated and stored in non volatile memory
============================
05. Authorization system for access and starting the engine05. Authorization system for access and starting the engine
DTCs: 2
----------------------------
00532 [0x0214]
Supply voltage
Status: Pending fault present during this driving cycle, Validated and stored in non volatile memory
----------------------------
00446 [0x01BE]
Work restriction due to insufficient voltage; Functional restriction due to undervoltage
Status: Pending fault present during this driving cycle, Validated and stored in non volatile memory

 

[Leighton82]

00819 [0x0333]
High Pressure Sensor-G65; High pressure sender-G65; Knock sensor 2-G66 signal too large
Status: Pending fault present during this driving cycle, Validated and stored in non volatile memory

01414 [0x0586]
Combustion Chamber Fan-V6; Combustion air blower-V6
Status: Pending fault present, Pending fault present during this driving cycle, Test conditions are met, Validated and stored in non volatile memory, Validated fault present at time of request
----------------------------
02251 [0x08CB]
Heater blocked; Heater locked
Status: Validated and stored in non volatile memory, Validated fault present at time of request
============================
34. Ride height control system34. Ride height control system
DTCs: 7
----------------------------
01583 [0x062F] Archive (inactive)
System leak detected; Leak detected in the system
Status: Validated and stored in non volatile memory
----------------------------
01772 [0x06EC]
Signal wire from pressure sensor for ride height control-G291; Signal line from level control pressure transmitter-G291
Status: Test is inhibited by other DTC, Validated and stored in non volatile memory
----------------------------
01400 [0x0578]
Ride height control system; Level control
Status: Pending fault present during this driving cycle, Validated and stored in non volatile memory
----------------------------
00446 [0x01BE]
Work restriction due to insufficient voltage; Functional restriction due to undervoltage
Status: Pending fault present during this driving cycle, Validated and stored in non volatile memory
----------------------------
01577 [0x0629]
Shutdown due to overheating; Shutdown due to excess temperature; Relay for electric fuel pump 1 short circuit to positive
Status: Pending fault present, Validated and stored in non volatile memory


----------------------------
00776 [0x0308]
Front Left Level Sensor-G78; Front left vehicle level sender-G78; Cyl. 8 misfires recognized
Status: Test is inhibited by other DTC, Validated and stored in non volatile memory
============================
37. Navigation system37. Navigation system
DTCs: 4
----------------------------
00446 [0x01BE]
Work restriction due to insufficient voltage; Functional restriction due to undervoltage
Status: Pending fault present during this driving cycle, Validated and stored in non volatile memory
----------------------------
02261 [0x08D5]
Storage Media-R118; Disk-R118
Status: Pending fault present during this driving cycle, Test conditions are met, Test is inhibited by other DTC, Validated and stored in non volatile memory, Validated fault present at time of request
----------------------------
03183 [0x0C6F]
Status: Validated and stored in non volatile memory, Validated fault present at time of request
----------------------------
02927 [0x0B6F] Archive (inactive)
Error reading DVD; DVD read error
Status: Validated and stored in non volatile memory
============================

 

[Leighton82]

Update. Cost of repairs £6k on a 2007 car that cost £5k. Feel sick. Can't believe a guy who is already a multimillionaire would deceive me by clearing warning lights and endanger me and my family in the process. Will lose thousands. Feel pretty stupid now.

 

[Charlie Farley]

There does appear to be a bit of a pattern, a lot of those are electrical faults, or maybe more a case of a lot are centred around one more general electrical issue, which is not uncommon to have a whole raft of faults that are cleared when one single point of failure is rectified.

Have you had it scanned with VCDS as that does help source faults very well.

I had a similar issue with my B7 , i had about 30 electrical faults and were all caused by one fault that wasnt even logged.

I replaced a known pair of engine management relays and all other issues were cleared, so , dont throw in the towel just yet.

 

[mikep99]

I know it sounds daft but make sure the battery is ok. Audi's throw loads of random codes if there's low voltage.

 

[Charlie Farley]

When anyone looks at that list they will either be mortified or not surprised.
It doesn't surprise me at all to see a list like that but then I know how fickle Audis can be and just a couple of small faults can cause so many fault codes that are not really problem parts.

If you are unsure on how to proceed then maybe worth while going to a reputable auto electrician for help before paying out on work from other garages.
To the Audi owner that has to rely on outside sources of repair etc and the high added cost that brings with it ,ownership can seem like a nightmare but it doesnt have to be.

 

[Charlie Farley]

Poor Earthing issues are a know issues accross many audi platforms along with cable age damage in the individual looms around the car, it only needs one damaged cable from the CCM module for example to a door controller and heaps will just stop working , also faulty relays and modules can create a lot of fault codes that are not faulty, a good auto electrian will be able to advise better rather than using the method of replacing everything on the list approach that most garages will take.

 

[Charlie Farley]

Best of luck with it chap.

 

[Charlie Farley]

There is also the reconfiguration factor that some specific modules and components will need after a fault has been logged on it or work performed on it.
Just clearing the log won't automatically clear all codes, steering angle for instance needs to be reset properly, abs pumps etc need to be cycled etc so ,so and so on .
Others will clear for a short time until the controller is activated but the fault will be logged until it been rectified correctly.

 

[Leighton82]

Thanks for the replies all. Really appreciated. Approached a few specialist autoelectricians in Leeds and 1st has only confirmed the garage's position based on the logs, claiming that an air suspension compressor alone is £1,900 plus VAT. Can't see this one working out well. An attractive heap of drunk that is basically for salvage and leaves me £4.5k out of pocket...maybe more. There are some right ******** out there.

 

[OliverHuntx]

There does appear to be a bit of a pattern, a lot of those are electrical faults, or maybe more a case of a lot are centred around one more general electrical issue, which is not uncommon to have a whole raft of faults that are cleared when one single point of failure is rectified.

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